(x+2)(x-2)-(x-2)^2 (x-y-1)^2 (3a-b+c)(3a+b-c)(x+2)(x-2)-(x-2)^2(x-y-1)^2(3a-b+c)(3a+b-c)(m-n)^2(m+n)^2
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(x+2)(x-2)-(x-2)^2 (x-y-1)^2 (3a-b+c)(3a+b-c)
(x+2)(x-2)-(x-2)^2
(x-y-1)^2
(3a-b+c)(3a+b-c)
(m-n)^2(m+n)^2
(x+2)(x-2)-(x-2)^2=(x-2)[(x+2)-(x-2)]=4(x-2)=4x-8
(x-y-1)^2=[(x-y)-1)]^2=(x-y)^2+1-2(x-y)=x^2+y^2-2xy+1-2x+2y=x^2+y^2-2xy-2x+2y+1
(3a-b+c)(3a+b-c)=[3a-(b-c)][3a+(b-c)]=9a^2-(b-c)^2=9a^2-(b^2+c^2-2bc)
=9a^2-b^2-c^2+2bc
(m-n)^2(m+n)^2=[(m-n)(m+n)]^2=(m^2-n^2)^2=m^4+n^4-2m^2 n^2
(x+2)(x-2)-(x-2)^2=X²-4-(X²-4X+4)=X²-4-X²+4X-4=4X-8
(x-y-1)^2 =x²+y²+1-2x-2xy+2y
(3a-b+c)(3a+b-c) =9a²-(b-c)²=9a²-b²+2bc-c²
(m-n)^2(m+n)^2 =(m²-n²)²=m^4-2m²n²+n^4
300字读后感 2篇 俄把格式说一下吧:《xxxx》(写题目)主要内容:x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x(写那篇文章的主要内容)思考分析:x x x
解九宫格题目(X为未知数)9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1
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